# CVE-2023-53891: Blackcat CMS 1.4 Stored Cross-Site Scripting via Page Modification

> Authenticated attackers can inject malicious scripts into page content, leading to code execution or account takeover when other users view the page.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Dec 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-f5gv-p76p-jp44

## What is CVE-2023-53891?

CVE-2023-53891 is a medium-severity cross-site scripting vulnerability in blackcat-cms Blackcat CMS, published on 15 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content. Attackers can insert JavaScript payloads in the page modification interface that execute when other users view the compromised page.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2023-53891?

It affects 1 product.


Products: Blackcat-Cms Blackcat Cms.

## How do I fix CVE-2023-53891?

No fix has been published for CVE-2023-53891 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-53891 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-53891 exists.

## Other vulnerabilities in blackcat-cms Blackcat CMS

- [CVE-2020-25453](https://insights.sbomify.com/CVE-2020-25453/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2017-14399](https://insights.sbomify.com/CVE-2017-14399/): File upload in n/a (high 8.8)
- [CVE-2017-14048](https://insights.sbomify.com/CVE-2017-14048/): Code injection in n/a (high 8.8)
- [CVE-2017-14050](https://insights.sbomify.com/CVE-2017-14050/): File upload in n/a (high 8.8)
- [CVE-2023-53892](https://insights.sbomify.com/CVE-2023-53892/): Blackcat CMS 1.4 Remote Code Execution via Jquery Plugin Manager (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-53891 and fix it if it is affected.

What it is: CVE-2023-53891 is a medium-severity cross-site scripting vulnerability in blackcat-cms Blackcat CMS, published on 15 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-53891 exists.

Affected product: blackcat-cms Blackcat CMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-53891/ (Markdown: https://insights.sbomify.com/CVE-2023-53891/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-53891
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-53891
- OSV: https://osv.dev/vulnerability/CVE-2023-53891

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-53891/
Summaries are generated and may contain mistakes; the official description above is the record.